Discussion
Porins are special proteins that act as channels in the outer membrane of gram-negative bacteria.
Answer: A
Correct answer: True
Porins are trimeric proteins forming water-filled channels through the outer membrane, admitting small hydrophilic molecules up to about 600 daltons. They are what make the outer membrane a selective barrier - and their size limit is one reason large antibiotics are so often useless against gram-negative bacteria.
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